This paper is an attempt to re-examine the question raised by Teiji Seta from the perspective of the activities of imagination in children’s encounters with picture books. Seta raises the following question, “What is a person’s first encounter with books, and what does it mean?” Children’s picture book experiences are often described as that of children entering picture books. What does the metaphor “entering into picture books” or “entering the world of picture books” mean? An elucidation of this question is the subject of this research. In this paper, I consider the activities of children’s imagination and the structure of picture books that evoke such imagination. I also consider the correspondence between pictures in the picture books t...